Image density control method

Details Image density control method Image density control method

1990-05-30

1991-08-06

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355204, 355214, G03G 2100

Patent

active

050381750

ABSTRACT:
A method of controlling the density of images produced by an electrophotographic image forming apparatus to a constant value. A toner density sensor is provided with a first reference level variable in response to the output of an image density sensor, and a second reference level representative of a state associated with the optimum condition of a developer (e.g. immediately after replacement thereof). During usual control, the toner concentration of the developer is detected on the basis of the output of the toner density sensor, and the toner supply to the developer is controlled on the basis of the result of comparison of the detected toner concentration and the first reference level.

REFERENCES:
patent: 4416535 (1983-11-01), Tottori
patent: 4468112 (1984-08-01), Suzuki
patent: 4572102 (1986-02-01), Yuge et al.
patent: 4758861 (1988-07-01), Nakamaru

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